I love how it feels like we're working towards the end with this book; a lot of characters from the past come back and the theme of people being a mix of good and bad is developed a lot. I adore the spy shenanigans too, and three chapters happening simultaneously was also a nice change of pace. 

I cared less about the actual plot but the way it was excecuted was rather nice. The choices of the baudelairs at the end were rather drastic though... People genuinely died in that fire, holy shit, and they know they're partially at fault.